Connecting-rod-reboring machine



Feb 1, 1927.

o. KYLIN CONNBGTING ROD REBORING MACHINE Filed Nov. s. 1924 2 Sheds-Sheet 1 HHH lin, l a

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coNuEcTING Ron REBORING MACHINE Filed Nov. s. 1924 2 sneets-sneet 2 29 .F9 5' Z@ ww A3g v il ingu-rodean fbe easily and '55 islet 'il-3 vin the base.`

i Patented Feb. 1, 1927.

mecca KYLIN, OF EIJKHTART, INDIKN'A, .COMPA`N`Y, 'OFELKHART, INDANA, A 'GORIQRATI'ON ASSIGNOR TO FOSTER-JOHNSON RE'AYIERy p GONNECTINGFROD-'BEBORING MAGEINE `Application led 'Norember 8, 1924. Serial N o. fil/18,531. f

` This inventon 'relates'to machines for reboring -the ibushings of connectingfrods of pistonsand theflke, and has for its main object to `provide an iimproved and more l rapidly; acting meansv .for effecting the reboringof ismall motoreconnecting rods, particulnrlythoseusedfin:antomobileengines.

Another object iis to provide .a ,machine wherebyzthe-.bearing bushing Y of fthe connectfqniclrly :rebored iwlrthout :the necessity of removing the bush- 'ngfromitsaseatzin the crank pin bearing fof themed.' V :Other foh'jfects :are tlc-,provide limproved m means forsupporting and centering the G011- ne'cting rod, and to provide ;a boring Ibar feed mechanism by Which the cutting tool can f beV qnicklyxrreturned to r starting position. 'iOthemobjectsf'a-nd attendant advantages-of 'inmilarwthitheiart 'fromithe 'followingde- -taileddeSc-ription, (taken in connection with fthe iaccompanying drawing `wherein l have 'illustrated arpractical and' approved embodif '45 zmenteoff he ffinventorl, and 'in Which-- "35 j'neeting 'rod rior the subsequent reboring op- Eig i5 is :a detail vview .part-ly in longitudiinel; section andpartly fin elevation showing f :the means vdior coupling the .boring -tool and Figfisaicross-sectionbn the linee-:6 QfxFgng and l ffii-sia NieWsim'ilar .to 'Finn 5.showing theperts, in Coupled relation.

10 designates aille-ibase of the machine, on twhich `slidably 'mounted-.a rest wpiece [11 adjustably secured to fthe base -by a ybolt :12 passing ,through the :bottom fof the rest piece yand a longitudinal 'Mounted on the `rest niece 5131 are la pair of saddle-blocks 14formed :in fthei'r iupper-snrfaces -with lalined transversely :disposed V-shaped 'notches"1 5, .the sides `gofswhich are preferably rectangular.

' it" These notches serve to seatand support the stem 24de ,bored at `its wrist-,pin .16 of a .piston connecting rod 17 by which the rod is swiveleol in the piston. The pin 16 Iis rmly secured in place by .a c1amp-plate18 ,resting at 'one end .on top `of the .pin bearingojl kthe connecting Arod r17 and at itsother end on an upstanding projection 11 .of `the lrest 11. The 4clamp plate 18 is screweddown on the .Work bya bolt 19 atits loWerend screwed into the upper ihorizontal .Wall 1.1a of the .rest 11 and .passing through la longitudinalslot .2O in the Vclamp plate 18, .andc-tensoned by Va nut 21 and Washer 22, this .latter jformed with a convex lower surface resting on the clamp plate 18, whereby to accommodate ythe boltand clamp plate to varyingdiameters of bearings in the seats 15.

The connecting.;` rod 7 at a point a .short distance inwardly ,of .its crank p inbearing is A.rested vupon a iseat or saddle 23 that is vmounted on the upper fendof around stem 24, .this lattcribeing .mounted to slide verti- `callyin ahole'bearinsl` Qormed in the base of an upright -frarne member 26 on and preferably integral -With the base 10. The .lower end to vhousea thrust spring 2,7 that is ,footed andcentered cna threadedcap 28fscrewed into the lower .end-.of thebearing 25. Onthe .upperlend of `the=frame member 26is anbverhanginghor- `izontal rarm .29, through which .extends -,a .threaded rod 30, on the lower end of which latter -is swiveled a clamp block .3 1. The spring27 andscrewO opposeeach otheLSo thatlthe .body .of the ,connecting rod 17 is securely,grippedbetween.the seat23 and the .cla-mp `block 31, -and is adjusted as to height .by merely .turning the sereinr 30 up or down.

.On the machine ibed 10, just beyond the Arod ,supporting .and clamping means lastndescribed are a pairof pillow7 blocks 32 and 33 carrying/bearings 34 and 35 respectively for :a boring bar 36; 4this Elatter equipped on one end ,with acrankhandle37 .for turningthe sameand, between its bearings, with the usualcutter 38. When the connecting; rod 17 is properly ,positionedto be rebored, the crank pin bearing and its bushing are laxially coincident with the boring bar 36. This accurate positioningof the crank pin bearingand its ,bnshingiseasily and quiclily effected .by adjusting the rest 11 lengthwise y'ofthe base -until the centering in a horizontal .direction is obtained, and then adjusting` Vthe screw 30 to secure yaccurate centering `in za .vertal direction. gHowever,

t0 insure more accurate results than are obtainable by the eye and skill of the operator, I have equipped the machine with a mechanical centering device shown in Fig. 4;

this consisting of a mandrel 39 of a size to accurately fit the opening in the pillow block 32 which supports the boring bar to be rebored is entered and centered by the i nose 40 of the mandrel, as clearly shown in Fig. 4. The centering mandrel 39 is then temporarily secured rigidly in place by the bearing binding screw 42, and the proper adjustments of the rear and front clamps are then made to insure the rigid and strong support of the connecting rod in the exact position established by the centering device 39.

On the pillow block 33 are apair of rearwardly extending arms 33 supporting at their outer kends a cross-head 43 having a transverse hole therein that is in coaxial alinement with the boringbar 36 and seats a nut 43 secured in place by a set screw 43, which nut 43 is engaged with a boring bar feed screw 44. This feed screw is detachably coupled at either end thereof to the end of the boring `bar 36 preferably by substantially the means sh'own in Figs. 5. 6 and 7. In the end of the boring bar 36 is a central bore 45 of a diameter to fit the smooth unthreaded end portions 44 of the feed screw 44. In each end portion 44 of the feed screw 44 is a radial coupling pin 46. In the bore 45 isa counter-sunk annular `groove 47 that receives the coupling pin 46. Between the groove 47 and the extreme end of the boring bar 36 are a pair of diametrically opposed slots 48, through either `of which the pin 46 can be enteredV into the annular groove 47. The rotarv movement of the boring bar is transmitted to the feed screw by a radial pin 49 mounted in the boring bar and extending across the path of the pin 46 in the groove or channel 47. A spring 50 seated in a reduced extension 45 of the bore 45 exerts a continuous thrust against the end of the feed screw and thereby prevents any lost motion or backlash between the feed screw and the boring bar which would have a deleterious effect on the smoothness of the cut.

The advantage of making the feed screw 44 so that it can be coupled at either end to the boring bar, is that when a .cut is finished the screw 44 and nut 43 can be withdrawn, turned end for end, and recoupled to the boring bar.

This saves considerable time by making is unnecessary to return the cutting tool to its starting position by turning the boring bar backwards, as would otherwise have to be done.

The intermediate supporting saddle 23, when adjusted to the proper height by the screw 30 is secured rigidly in position by a horizontal locking screw" 5l threading into a bearing 52 on the base 10 and abutting against the outer end of a rod 53 that is slidably fitted in the bearing 52 and at its inner end abuts against the stem or shank 24 of the connecting rod saddle 23.

lVhile I have herein shown and described one physical embodiment of the invention which in practice has been found to satisfactorily effectuate the stated purposes and objects thereof, it is manifest that the details of structure and organization herein described and shown may be variously modified and changed within the principle of the invention and without sacrificing any of the advantages thereof. Hence, I reserve all such variations and modifications as fall withinthe spirit and purview of the appended claims.

I claiml. In a machine for reboring connecting rods, the combination of a frame, means for supporting and clamping the wrist pin of the rod, means for centering` the connecting rod bearing, and means for holding the connecting rod in the position fixed by said centering means; said holding means comprising an upwardly spring-pressed saddle, a vertically adjustable clamp mounted above said saddle, and means for locking said saddle in adjusted position.

2. In a machine for reboring connecting rods, the combination of a frame, a boring har and feed mechanism therefor mounted in said frame, a support and clamp for the wrist pin of the rod adjustable on said frame toward and from the boring bar, and means for holding the connecting rod at a point thereon adjacent to the bearing to be rebored, said holding means comprising an upwardly spring-pressed saddle having a V-shaped seat for the connecting rod, a clamp'block engageable with the upper side of the connecting rod, a clamp block adjusting screw engaged with said clamp block, and means for locking said saddle in adjusted position.

3. In a machine for reboring connecting rods, the combination of a frame, a boring bar and feed mechanism therefor mounted in said frame, a wrist pin support comprising a rest piece adjustable on said frame toward and from the boring bar, a pair of spaced saddle blocks on said rest piece formed with alined V-shaped notches in their upper sides to seat the wrist pin7 and means for clamping said wrist pin in said notches; and means for holding the connecting rod at a point thereon adjacent to the bearing t0 be rebored, said holding means comprising an upwardly spring-pressed saddle having a V- shaped seat for the connecting rod, a clamp end to said Clam block, and means for locking said saddle 1n adjusted position.

4. In a machine of the character described, the combination of a frame, a boring bar journaled therein, a feed Screw mounted in said frame and removably coupled to one end of said boring bar, co-operating means on said boring bar and feed screw for transmitting rotary movement of the former f to the latter, and a thrust spring between the opposed ends of said boring bar and feed L yScrew for eliminating lost `motion in a lengthwise direction between said boring bar and feed screw.

5. In a machine of the character described, the combination of a frame, a boring bar journaled therein and formed with a bore in one end thereof, an annular groove in the wall of said bore, and a stop pin intersecting said groove; a stationary nut mounted in said frame, a feed screw engaged with said nut and at one end entering the bore of said boring bar, a radial pin in said feed screw engaged in said annular groove; and a thrust spring between the bottom of said bore and the opposed end of said feed screw serving to prevent endwise play between said boring bar and feed screw.

osKAR KYLIN. 

